class_docstr: load and select cursors based on the key press
      
code: def __load_cursors(cls):
      cursors = {
          (DrawingMode.NoDraw, DrawingShape.NoShape): QCursor(
              Qt.ArrowCursor
          )
      }
      for k in cls.key_to_drawstate:
          px = QPixmap(cursors_xpm[k])
          mask = px.createHeuristicMask()
          px.setMask(mask)
          cursor = QCursor(px, 0, 0)  # hot point is always top left
          (mode, shape) = cls.key_to_drawstate[k]
          cursors[(mode, shape)] = cursor
      return cursors
  
file_path: nptsne/demos/ExtendedHSNEDemo/cursors.py
imports: from enum import Enum
  from PyQt5.QtGui import QCursor, QPixmap
  from PyQt5.QtCore import Qt
label_desc: Use image node_id 1 for calling the DrawingCursors obj's underlying member method code with example usage: obj.__load_cursors(cls) and returns: cursors